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a group of metallic elements that have two electrons in their outer shells and react easily with other elements. Group 2 in the periodic table.
a reaction in which heat is absorbed from the surroundings and the temperature of the reaction...
non-rechargeable cells, such as the zinc-carbon torch cell.
the phase in matter in which the particles are far apart and can move freely.
centre part of an atom with positive charge concentrated in a tiny kernel.
reactions in which two or more molecules react to form one molecule.